Journal
EUROPEAN POLYMER JOURNAL
Volume 164, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2021.110967
Keywords
Lignin; Carboxymethylation modification; Polyacrylamide; Waste water treatment
Categories
Funding
- National Natural Science Foundation of China [22038004, 22078116]
- Guangdong Provincial Key Research and Development Program [2020B1111380002]
- Natural Science Foundation of Guangdong Province [2021A1515010121, 2021A1515010289]
- Opening Project of Key Laboratory of Polymer Processing Engineering (South China University of Technology), Ministry of Education [KFKT2005]
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The high efficiency lignin-grafted cationic polyacrylamide multifunctional flocculant demonstrated excellent performance in efficient flocculation and copper ion removal. It is characterized by its low cost, environmentally friendly nature, and technical feasibility, making it a promising solution for wastewater treatment.
High efficiency lignin-grafted cationic polyacrylamide multifunctional flocculant (CL-CPAs) was synthesized via grafting to strategy using carboxymethylated lignin (CL), acrylamide (AM) and methylacryloyloxyethyl-trimethyl ammonium chloride (DMC) as raw materials. The synthesized CL-CPAs showed high flocculation efficiency. Only a small dosage between 3.6 and 4.2 mg.L-1 of CL-CPAs and a short flocculation time of 1-2 min were needed for sedimentation of kaolin suspension. Meanwhile, the carboxyl groups on the modified lignin endowed CL-CPAs with good copper ion capture function through complexation and electrostatic interaction. In addition, simultaneous flocculation of kaolin suspension and removal of copper ion was achieved for CL-CPAs attributing to the charge neutralization, bridging, and electrostatic complexation. The synthesized carboxymethylated lignin-based flocculants are cheap, environmentally friendly and technically feasible, showing broad prospects in wastewater treatment.
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